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Remove reserved_reg functionality. (#424)

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* Remove reserved_reg functionality.

This wasn't implemented, and if we need it in the future, it seems like
it would be better to extend the concept of global values to cover this.

* Use GlobalValue::reserved_value() for sentinal values.
This commit is contained in:
Dan Gohman
2018-07-31 07:57:37 -07:00
committed by GitHub
parent d9d40e1cdf
commit 1b42105faa
7 changed files with 23 additions and 57 deletions
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10
cranelift/docs/langref.rst
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@@ -689,16 +689,13 @@ trap when accessed.
Declare a static heap in the preamble.
:arg Base: Global value holding the heap's base address or
``reserved_reg``.
:arg Base: Global value holding the heap's base address.
:arg MinBytes: Guaranteed minimum heap size in bytes. Accesses below this
size will never trap.
:arg BoundBytes: Fixed heap bound in bytes. This defines the amount of
address space reserved for the heap, not including the guard pages.
:arg GuardBytes: Size of the guard pages in bytes.
The ``reserved_reg`` option is not yet implemented.
Dynamic heaps
~~~~~~~~~~~~~
@@ -710,15 +707,12 @@ is resized. The bound of a dynamic heap is stored in a global value.
Declare a dynamic heap in the preamble.
:arg Base: Global value holding the heap's base address or
``reserved_reg``.
:arg Base: Global value holding the heap's base address.
:arg MinBytes: Guaranteed minimum heap size in bytes. Accesses below this
size will never trap.
:arg BoundGV: Global value containing the current heap bound in bytes.
:arg GuardBytes: Size of the guard pages in bytes.
The ``reserved_reg`` option is not yet implemented.
Heap examples
~~~~~~~~~~~~~

8
cranelift/filetests/parser/memory.clif
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@@ -52,11 +52,11 @@ ebb0:
; Declare static heaps.
function %sheap(i32, i64 vmctx) -> i64 {
heap1 = static reserved_reg, min 0x1_0000, bound 0x1_0000_0000, guard 0x8000_0000
heap1 = static gv5, min 0x1_0000, bound 0x1_0000_0000, guard 0x8000_0000
heap2 = static gv5, guard 0x1000, bound 0x1_0000
gv5 = vmctx+64
; check: heap1 = static reserved_reg, min 0x0001_0000, bound 0x0001_0000_0000, guard 0x8000_0000
; check: heap1 = static gv5, min 0x0001_0000, bound 0x0001_0000_0000, guard 0x8000_0000
; check: heap2 = static gv5, min 0, bound 0x0001_0000, guard 4096
ebb0(v1: i32, v2: i64):
v3 = heap_addr.i64 heap1, v1, 0
@@ -66,12 +66,12 @@ ebb0(v1: i32, v2: i64):
; Declare dynamic heaps.
function %dheap(i32, i64 vmctx) -> i64 {
heap1 = dynamic reserved_reg, min 0x1_0000, bound gv6, guard 0x8000_0000
heap1 = dynamic gv5, min 0x1_0000, bound gv6, guard 0x8000_0000
heap2 = dynamic gv5, bound gv6, guard 0x1000
gv5 = vmctx+64
gv6 = vmctx+72
; check: heap1 = dynamic reserved_reg, min 0x0001_0000, bound gv6, guard 0x8000_0000
; check: heap1 = dynamic gv5, min 0x0001_0000, bound gv6, guard 0x8000_0000
; check: heap2 = dynamic gv5, min 0, bound gv6, guard 4096
ebb0(v1: i32, v2: i64):
v3 = heap_addr.i64 heap2, v1, 0

23
lib/codegen/src/ir/heap.rs
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@@ -7,8 +7,8 @@ use std::fmt;
/// Information about a heap declaration.
#[derive(Clone)]
pub struct HeapData {
/// Method for determining the heap base address.
pub base: HeapBase,
/// The address of the start of the heap's storage.
pub base: GlobalValue,
/// Guaranteed minimum heap size in bytes. Heap accesses before `min_size` don't need bounds
/// checking.
@@ -21,18 +21,6 @@ pub struct HeapData {
pub style: HeapStyle,
}
/// Method for determining the base address of a heap.
#[derive(Clone)]
pub enum HeapBase {
/// The heap base lives in a reserved register.
///
/// This feature is not yet implemented.
ReservedReg,
/// The heap base is a global value.
GlobalValue(GlobalValue),
}
/// Style of heap including style-specific information.
#[derive(Clone)]
pub enum HeapStyle {
@@ -57,12 +45,7 @@ impl fmt::Display for HeapData {
HeapStyle::Static { .. } => "static",
})?;
match self.base {
HeapBase::ReservedReg => write!(f, " reserved_reg")?,
HeapBase::GlobalValue(gv) => write!(f, " {}", gv)?,
}
write!(f, ", min {}", self.min_size)?;
write!(f, " {}, min {}", self.base, self.min_size)?;
match self.style {
HeapStyle::Dynamic { bound_gv } => write!(f, ", bound {}", bound_gv)?,
HeapStyle::Static { bound } => write!(f, ", bound {}", bound)?,

2
lib/codegen/src/ir/mod.rs
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@@ -31,7 +31,7 @@ pub use ir::extfunc::{AbiParam, ArgumentExtension, ArgumentPurpose, ExtFuncData,
pub use ir::extname::ExternalName;
pub use ir::function::Function;
pub use ir::globalvalue::GlobalValueData;
pub use ir::heap::{HeapBase, HeapData, HeapStyle};
pub use ir::heap::{HeapData, HeapStyle};
pub use ir::instructions::{InstructionData, Opcode, ValueList, ValueListPool, VariableArgs};
pub use ir::jumptable::JumpTableData;
pub use ir::layout::Layout;

6
lib/codegen/src/legalizer/heap.rs
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@@ -154,11 +154,7 @@ fn offset_addr(
}
// Add the heap base address base
match pos.func.heaps[heap].base {
ir::HeapBase::ReservedReg => unimplemented!(),
ir::HeapBase::GlobalValue(base_gv) => {
let base_gv = pos.func.heaps[heap].base;
let base = pos.ins().global_value(addr_ty, base_gv);
pos.func.dfg.replace(inst).iadd(base, offset);
}
}
}

21
lib/reader/src/parser.rs
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@@ -8,9 +8,8 @@ use cranelift_codegen::ir::instructions::{InstructionData, InstructionFormat, Va
use cranelift_codegen::ir::types::VOID;
use cranelift_codegen::ir::{
AbiParam, ArgumentExtension, ArgumentLoc, Ebb, ExtFuncData, ExternalName, FuncRef, Function,
GlobalValue, GlobalValueData, Heap, HeapBase, HeapData, HeapStyle, JumpTable, JumpTableData,
MemFlags, Opcode, SigRef, Signature, StackSlot, StackSlotData, StackSlotKind, Type, Value,
ValueLoc,
GlobalValue, GlobalValueData, Heap, HeapData, HeapStyle, JumpTable, JumpTableData, MemFlags,
Opcode, SigRef, Signature, StackSlot, StackSlotData, StackSlotKind, Type, Value, ValueLoc,
};
use cranelift_codegen::isa::{self, Encoding, RegUnit, TargetIsa};
use cranelift_codegen::packed_option::ReservedValue;
@@ -168,7 +167,7 @@ impl<'a> Context<'a> {
self.map.def_heap(heap, loc)?;
while self.function.heaps.next_key().index() <= heap.index() {
self.function.create_heap(HeapData {
base: HeapBase::ReservedReg,
base: GlobalValue::reserved_value(),
min_size: Imm64::new(0),
guard_size: Imm64::new(0),
style: HeapStyle::Static {
@@ -1123,8 +1122,7 @@ impl<'a> Parser<'a> {
// heap-decl ::= * Heap(heap) "=" heap-desc
// heap-desc ::= heap-style heap-base { "," heap-attr }
// heap-style ::= "static" | "dynamic"
// heap-base ::= "reserved_reg"
// | GlobalValue(base)
// heap-base ::= GlobalValue(base)
// heap-attr ::= "min" Imm64(bytes)
// | "max" Imm64(bytes)
// | "guard" Imm64(bytes)
@@ -1136,17 +1134,12 @@ impl<'a> Parser<'a> {
let style_name = self.match_any_identifier("expected 'static' or 'dynamic'")?;
// heap-desc ::= heap-style * heap-base { "," heap-attr }
// heap-base ::= * "reserved_reg"
// | * GlobalValue(base)
// heap-base ::= * GlobalValue(base)
let base = match self.token() {
Some(Token::Identifier("reserved_reg")) => HeapBase::ReservedReg,
Some(Token::GlobalValue(base_num)) => {
let base_gv = match GlobalValue::with_number(base_num) {
Some(Token::GlobalValue(base_num)) => match GlobalValue::with_number(base_num) {
Some(gv) => gv,
None => return err!(self.loc, "invalid global value number for heap base"),
};
HeapBase::GlobalValue(base_gv)
}
},
_ => return err!(self.loc, "expected heap base"),
};
self.consume();

2
lib/wasm/src/environ/dummy.rs
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@@ -172,7 +172,7 @@ impl<'dummy_environment> FuncEnvironment for DummyFuncEnvironment<'dummy_environ
let gv = func.create_global_value(ir::GlobalValueData::VMContext { offset: 0.into() });
func.create_heap(ir::HeapData {
base: ir::HeapBase::GlobalValue(gv),
base: gv,
min_size: 0.into(),
guard_size: 0x8000_0000.into(),
style: ir::HeapStyle::Static {